Cloth diapers---www.nurturedfamily.com. They have the very best diapers, and fantastic service, plus they're really nice people (I know the owners). They'll answer any questions you have and make suggestions that are very helpful. I use the Fuzzi Bunz and love them, but Rebecca has told me there is a newer diaper that they carry since I bought mine, that she really likes alot. Call their 800#, or order online.
Breasts--I was a 32B, and my breasts did not change at all until the day before I gave birth. Then I was an E cup and had no trouble with breastfeeding! I have several friends who are small too, and their breasts did not change as much, but they still had plenty of milk. It's very important to eat alot of food, drink alot of water, stay off medications, especially cold/allergy meds, and relax about the whole thing. Breastfeeding time is no time for dieting---it's time to make milk, and you need alot of food and water to do so. Any local La Leche League can offer alot of information and tips if needed. Some are breastmilk Nazi's, so take it all in stride! Good luck to your daughter and her new baby! Have fun!!!!